def set_blocksize(self, blocksize):
"""
docstring
"""
self.blocksize = int_to_iso711(int(math.log(blocksize, 2)))
def set_alg(self, algorithm):
"""
docstring
"""
self.alg_id = int_to_iso711(algorithm.value)
class ZISOFS(commonZisofs):
# HEADER
hdr_magic = b'\x37\xE4\x53\x96\xC9\xDB\xD6\x07' # Magick Header
size = None # Uncompressed size
hdr_size = int_to_iso711(4) # Header size
# Array
pointers_size = 4
@staticmethod
def from_header(header):
"""
docstring
"""
header = header[0:ZISOFS.get_header_size()]
# Make sure is bytes
if not isinstance(header, (bytes, bytearray)):
raise ValueError
# Header magic
if header[0:8] != ZISOFS.hdr_magic:
raise NotCompressedFile
# Correct size
if len(header) != 4 * iso711_to_int(ZISOFS.hdr_size):
raise IllegalZisofsFormat
# Header size
if header[12:13] != ZISOFS.hdr_size:
raise IllegalZisofsFormat
zisofs_obj = ZISOFS()
# File size
zisofs_obj.size = header[8:12]
# Blocksize
if iso711_to_int(header[13:14]) not in default_block_sizes:
raise IllegalZisofsFormat
zisofs_obj.blocksize = header[13:14]
return zisofs_obj
def set_size(self, size):
"""
docstring
"""
self.size = int_to_iso731(size)
def get_size(self):
"""
docstring
"""
return iso731_to_int(self.size)
def set_blocksize(self, blocksize):
"""
docstring
"""
self.blocksize = int_to_iso711(int(math.log(blocksize, 2)))
def get_algorithm(self):
"""
docstring
"""
return Algorithm(1) # Force return ZLIB compressor
def __bytes__(self):
header = bytearray()
header.extend(self.hdr_magic) # 8
header.extend(self.size) # 4
header.extend(self.hdr_size) # 1
header.extend(self.blocksize) # 1
header.extend(bytearray(2)) # 2
return bytes(header)
class ZISOFSv2(commonZisofs):
# Header
hdr_magic = b'\xEF\x22\x55\xA1\xBC\x1B\x95\xA0' # Magick Header
hdr_version = int_to_iso711(0)
hdr_size = int_to_iso711(6) # 24 bytes size
alg_id = None
size = None
# Array
pointers_size = 8
@staticmethod
def from_header(header):
"""
docstring
"""
header = header[0:ZISOFSv2.get_header_size()]
# Make sure is bytes
if not isinstance(header, (bytes, bytearray)):
raise ValueError
# Header magic
if header[0:8] != ZISOFSv2.hdr_magic:
raise NotCompressedFile
# Correct size
if len(header) != 4 * iso711_to_int(ZISOFSv2.hdr_size):
raise IllegalZisofsFormat
# Header size
if header[9:10] != ZISOFSv2.hdr_size:
raise IllegalZisofsFormat
zisofs_obj = ZISOFSv2()
# Algorithm
if iso711_to_int(header[10:11]) == 0:
raise IllegalZisofsFormat
zisofs_obj.alg_id = header[10:11]
# Blocksize
if iso711_to_int(header[11:12]) not in default_block_sizes:
raise IllegalZisofsFormat
zisofs_obj.blocksize = header[11:12]
# File size
zisofs_obj.size = header[12:20]
return zisofs_obj
def set_size(self, size):
"""
docstring
"""
self.size = int_to_uint64(size)
def get_size(self):
"""
docstring
"""
return uint64_to_int(self.size)
def set_blocksize(self, blocksize):
"""
docstring
"""
self.blocksize = int_to_iso711(int(math.log(blocksize, 2)))
def set_alg(self, algorithm):
"""
docstring
"""
self.alg_id = int_to_iso711(algorithm.value)
def get_algorithm(self):
"""
docstring
"""
return Algorithm(iso711_to_int(self.alg_id))
def __bytes__(self):
header = bytearray()
header.extend(self.hdr_magic) # 8
header.extend(self.hdr_version) # 1
header.extend(self.hdr_size) # 1
header.extend(self.alg_id) # 1
header.extend(self.blocksize) # 1
header.extend(self.size) # 8
header.extend(bytearray(4)) # 4
return bytes(header)